/Engine/Source/Runtime/Slate/Public/Framework/Application/NavigationConfig.h
Notified when navigation has caused a widget change to occur
virtual void OnNavigationChangedFocus ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > OldWidget, [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > NewWidget, [FFocusEvent](API\Runtime\SlateCore\Input\FFocusEvent) FocusEvent )